They are dissimilar and can't even be compared
BlackRock is an ETF
They are custodians that help investors manage their Bitcoin
They don't own it
Unlike Strategy that buys via DCA and it's added to their company portfolio.
So Strategy easily
Since BlackRock don't buy not to mention engage in DCA.
This is partially right because BlackRock does buy bitcoin on the open market, but it is on behalf of the ETF holders, and it still has the same effect on the market. So saying they "don't buy" is a bit misleading imo.
With strategy, Saylor can wake up tomorrow and decide to buy another 20k BTC using a new debt raise, nobody stops him. With BlackRock, the buying only happens when new money comes in to the ETF from retail or institutional investors, so they can't really "decide" to buy aggressively on their own.
With that said, the overall inflows into the ETFs have been rather substantial, and the spread between the two is not that significant at the moment, if crypto gets hyped again and ETF inflows surge like they did in early 2024, then BlackRock could close that gap quickly...
I wouldn't call it an easy win for Strategy, it depends on market conditions and what Saylor does with his money.